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New Member

packet size of 1558 bytes too big

We are a ISP .  In our PE cisco router , we received  logs  :

.Jun  8 17:40:14:%LINK-4-TOOBIG: Interface FastEthernet1/1/0,Output packet size of 1558 bytes too big

I have refered to cisco teach support . Find a message like it :

Error Message

%LINK-4_TOOBIG  :  Interface [chars], output packet size of [dec]bytes too big

     Explanation    An internal software error has occurred

     Recommended Action   Copy the error message exactly as it appears on the console or in the system log, contact your Cisco technical support representaive, and provide the representative with the gathered information.

The question is What internal software refer to ?  If it means the cisco ios has error or the soft of client has error ?

Thank you.....

Hall of Fame Super Silver

Re: packet size of 1558 bytes too big

Hello Levi,

are you using MPLS in your environment?

this can be also the result of the attempt of switching a packet in MPLS

Hope to help


New Member

Re: packet size of 1558 bytes too big

Hello Giuseppe,

Thank you for your help

As you said , We are using MPLS in our environment.

It may be a attempt .

I want to know how is the attempt perform and how to defense?

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